Overview
The AD7747ARUZ, produced by Analog Devices Inc., is a high-resolution, Σ-Δ capacitance-to-digital converter (CDC) integrated with a temperature sensor. This device is designed to provide precise capacitance measurements and is suitable for various industrial, automotive, and medical applications. The AD7747 features a 24-bit resolution with no missing codes, achieving up to 19.5-bit effective resolution, and offers high linearity and accuracy. It operates within a wide temperature range of −40°C to +125°C and supports a single-supply voltage from 2.7 V to 5.25 V.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| VDD | 2.7 | - | 5.25 | V | Single-supply operation |
| Current Consumption | - | 0.7 | - | mA | - |
| Operating Temperature | −40 | - | +125 | °C | - |
| Capacitive Input Range | ±8.192 | - | - | pF | Factory calibrated |
| Resolution | - | 24-bit (up to 19.5-bit ENOB) | - | - | No missing codes |
| Linearity | - | ±0.01% | - | - | - |
| Accuracy | - | ±10 fF | - | - | Factory calibrated |
| Update Rate | 5 | - | 45 | Hz | - |
| Temperature Sensor Resolution | - | 0.1 | - | °C | - |
| Temperature Sensor Accuracy | - | ±2 | - | °C | - |
| Package | - | - | - | - | 16-Lead TSSOP |
Key Features
- High-resolution, Σ-Δ capacitance-to-digital converter with up to 19.5-bit effective resolution.
- Interfaces to single or differential grounded sensors.
- High linearity (±0.01%) and high accuracy (±10 fF factory calibrated).
- Simultaneous 50 Hz and 60 Hz rejection at 8.1 Hz update rate.
- Active shield for shielding sensor connection.
- On-chip temperature sensor with 0.1°C resolution and ±2°C accuracy.
- Voltage input channel and internal clock oscillator.
- 2-wire serial interface (I2C® compatible).
Applications
- Automotive systems: Pressure measurement, position sensing, proximity sensing.
- Industrial systems: Level sensing, flow metering, impurity detection.
- Medical systems: Various sensing applications requiring high precision and reliability.
Q & A
- What is the resolution of the AD7747 capacitance-to-digital converter?
The AD7747 has a 24-bit resolution with up to 19.5-bit effective resolution (ENOB).
- What is the operating temperature range of the AD7747?
The AD7747 operates within a temperature range of −40°C to +125°C.
- What is the typical current consumption of the AD7747?
The typical current consumption is 0.7 mA.
- What is the capacitance input range of the AD7747?
The capacitance input range is ±8.192 pF, factory calibrated.
- Does the AD7747 have a built-in temperature sensor?
Yes, the AD7747 includes an on-chip temperature sensor with 0.1°C resolution and ±2°C accuracy.
- What type of interface does the AD7747 use for data transfer?
The AD7747 uses a 2-wire serial interface (I2C® compatible).
- What is the package type of the AD7747?
The AD7747 is packaged in a 16-Lead TSSOP.
- What are some common applications of the AD7747?
Common applications include automotive, industrial, and medical systems for pressure measurement, position sensing, proximity sensing, level sensing, flow metering, and impurity detection.
- What is the voltage supply range for the AD7747?
The AD7747 operates with a single-supply voltage from 2.7 V to 5.25 V.
- Does the AD7747 support simultaneous noise rejection?
Yes, it supports simultaneous 50 Hz and 60 Hz rejection at an 8.1 Hz update rate.
